A ball has a mass of 0.5 kg. Dropped from a cliff top. the ball hits the sea below at a speed of 10 m/s. What was the ball's gravitational potential energy before it was dropped?

25 J

Explanation:

Using Law of Conservation of Energy

Total Energy before = Total Energy After

Potential Energy1 + Kinetic Energy1 = Potential Energy2 + Kinetic Energy2

Potential Energy1 + 0 = 0 + Kinetic Energy2

Potential Energy1 = =0.5*0.5*10*10= 25 J

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles